Electrochemical behaviour of zinc-rich epoxy paints in 3% NaCl solution

Abreu, C.M.; Izquierdo, M.; Keddam, M.; Nóvoa, X.R.; Takenouti, H.

doi:10.1016/0013-4686(96)00021-7

Cited by 199 publications

(145 citation statements)

References 11 publications

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“…However it is often taken in practical as being the time which the potential remains lower than -0.85V SCE [9]. The ZRP coated panel potentials are monitored up to 22 days and presented in Due to the high permeability of ZRP coatings, immediately upon immersion in the electrolyte the potential is about -0.98V SCE , a value which is close to the potential of zinc in sea water.…”

Section: Open Circuit Potential Measurementsmentioning

confidence: 99%

Electrochemical Impedance Spectroscopy on Thermal Ageing Evaluation of Epoxy Coating Containing Zinc Rich Primer

Sharer¹

2013

IJRET

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Section: Open Circuit Potential Measurementsmentioning

confidence: 99%

Electrochemical Impedance Spectroscopy on Thermal Ageing Evaluation of Epoxy Coating Containing Zinc Rich Primer

Sharer¹

2013

IJRET

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“…Esta medida se realiza sin electrólito, utilizando una cola de plata como electrodo auxiliar (6). La impedancia así determinada corresponde por tanto a las características dieléctricas del recubrimiento.…”

Section: Comportamiento Dieléctricounclassified

“…a + x -.da f-a 1 [6] contacto eléctrico entre partículas de zinc. Por otro lado, teniendo en cuenta que este espesor es extremadamente pequeño, la existencia de óxido de zinc nativo y su transformación durante la exposición en productos de naturaleza química distinta, será el factor determinante en la protección galvánica del acero.…”

Section: Comportamiento Dieléctricounclassified

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Influencia de distintos medios agresivos en la acción protectora de las pinturas ricas en zinc

Abreu¹,

Izquierdo²,

Nóvoa³

et al. 1999

REVMETAL

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Resumen En este trabajo se pretende determinar la influencia de distintos agentes corrosivos atmosféricos en la protección anticorrosiva que ejercen las pinturas ricas en zinc de base silicato inorgánico. Sobre las muestras pintadas, y una vez han curado, se depositan periódicamente disoluciones de sulfato y de cloruro, tanto de forma independiente como conjunta. Con objeto de determinar la validez de los ensayos de inmersión, habitualmente utilizados en este tipo de estudios, las pinturas se exponen en cámara de humedad a 20 °C y 60 % de humedad relativa, lo que sería equiparable a ambientes naturales relativamente secos y que, sin embargo, permiten la corrosión del zinc. La evolución de las pinturas se estudia mediante espectroscopia de impedancia electroquímica. Los espectros obtenidos se interpretan en función de modelos de circuitos equivalentes. Esta metodología permite establecer que el mecanismo de protección está influido, tanto por la presencia de agentes contaminantes, como por las condiciones de exposición. Los resultados ponen de manifiesto la rápida evolución a un mecanismo de protección tipo barrera.Palabras clave: Pinturas ricas en zinc. Contaminantes. Espectroscopia de impedancia electroquímica. Corrosión del zinc. Corrosión atmosférica. Influence of different aggressive media on the protective behaviour of zinc rich paints AbstractThe aim of the present work is to determine the influence that different atmospheric agents have in steel protection by zinc rich paints based on inorganic silicate binder. The presence of pollutants in the atmosphere has been simulated by periodical deposition of sulphate and/or chloride solutions on the surface of the samples. With the aim of determining the validity of immersion tests, usually used in these types studies, the samples were kept in a controlled atmosphere at 20 °C and 60 % RH. These exposition conditions could represent a relative dry atmosphere allowing the zinc corrosión. Electrochemical impedance spectroscopy was employed to follow the time evolution of the studied paints. The corresponding impedance spectra were modelled using an electrical equivalent circuit approach. This methodology allows establishing that pollutants as well as weathering conditions define the protecting mechanism of these zinc rich paints. The results show a fast evolution towards a barrier-type protecting mechanism.

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“…Such contribution is taken into account through the resistive, R 3 , and capacitive, CPE 3 , parameters. The diffusional component CPE 4 ≡ Z d obtained at certain exposure times was associated to the oxygen diffusion-controlled reaction usually found in zinc corrosion [26,[31][32][33][34][35][36]. Difficulties were sometimes found while attempting to provide an accurate physical description of the processes.…”

Section: Impedance Data Treatmentmentioning

confidence: 99%

Behavior of Electrogalvanized Steel Pre-Treated with Cr(III)-Based Baths and Exposed to 0.5 M Na2SO4 Solution

Tomachuk¹,

Elsner

Sarli

2012

Port. Electrochim. Acta

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As Cr (VI) compounds used to formulate conversion layers provide enhanced anticorrosive protection to zinc coatings, but they are produced using hazardous chemicals, the development of "green" technologies is a paramount purpose. Consequently, the corrosion behavior of zinc coatings subjected to a Cr 3+ based passivating treatment, with and without sealing, was studied through EIS measurements in 0.5 M Na 2 SO 4 solution. The analyses of the experimental data allowed inferring that the Cr 3+ -based conversion treatment with an adequate sealer provides good corrosion resistance and, coupled to an adequate painting system, could be a suitable alternative to traditional chromate coatings.

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Electrochemical behaviour of zinc-rich epoxy paints in 3% NaCl solution

Cited by 199 publications

References 11 publications

Electrochemical Impedance Spectroscopy on Thermal Ageing Evaluation of Epoxy Coating Containing Zinc Rich Primer

Electrochemical Impedance Spectroscopy on Thermal Ageing Evaluation of Epoxy Coating Containing Zinc Rich Primer

Influencia de distintos medios agresivos en la acción protectora de las pinturas ricas en zinc

Behavior of Electrogalvanized Steel Pre-Treated with Cr(III)-Based Baths and Exposed to 0.5 M Na2SO4 Solution

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